Interview Questions
Practice the exact questions companies are asking right now.
"I got asked a hardcore MCM DP question and I saw it on PracHub as well. Solved that question in 5 minutes. Without PracHub I doubt I could solve it in 5 hours. Though somehow didn't get hired, perhaps I guess I solved it too fast? /s"
"Believe me i'm a student here jn US. Recently interviewed for MSFT. They asked me exact question from PracHub. I saw it the night before and ignored it cause why waste time on random sites. I legit wanna go back and redo this whole thing if I had chance. Not saying will work for everyone but there is certainly some merit to that website. And i'm gonna use it in future prep from now on like lc tagged"
"10 years of experience but never worked at a top company. PracHub's senior-level questions helped me break into FAANG at 35. Age is just a number."
"I was skeptical about the 'real questions' claim, so I put it to the test. I searched for the exact question I got grilled on at my last Meta onsite... and it was right there. Word for word."
"Got a Google recruiter call on Monday, interview on Friday. Crammed PracHub for 4 days. Passed every round. This platform is a miracle worker."
"I've used LC, Glassdoor, and random Discords. Nothing comes close to the accuracy here. The questions are actually current — that's what got me. Felt like I had a cheat sheet during the interview."
"The solution quality is insane. It covers approach, edge cases, time complexity, follow-ups. Nothing else comes close."
"Legit the only resource you need. TC went from 180k -> 350k. Just memorize the top 50 for your target company and you're golden."
"PracHub Premium for one month cost me the price of two coffees a week. It landed me a $280K+ starting offer."
"Literally just signed a $600k offer. I only had 2 weeks to prep, so I focused entirely on the company-tagged lists here. If you're targeting L5+, don't overthink it."
"Coaches and bootcamp prep courses cost around $200-300 but PracHub Premium is actually less than a Netflix subscription. And it landed me a $178K offer."
"I honestly don't know how you guys gather so many real interview questions. It's almost scary. I walked into my Amazon loop and recognized 3 out of 4 problems from your database."
"Discovered PracHub 10 days before my interview. By day 5, I stopped being nervous. By interview day, I was actually excited to show what I knew."
"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."
"The search is what sold me. I typed in a really niche DP problem I got asked last year and it actually came up, full breakdown and everything. These guys are clearly updating it constantly."
Maximize Boxes Stored Through One Entrance
You are given two integer arrays: - boxes[i]: the height of the i-th box. - rooms[j]: the height limit of the j-th room in a linear warehouse. The war...
How would you evaluate a carousel launch?
You are the data scientist supporting Pinterest's home feed. Product wants to add a horizontally scrollable carousel at the top of the app, similar to...
Design a Distributed Metrics Counter
Design a distributed metrics counter service for internal product telemetry. The service should support: - increment(metric_name, delta, tags, timesta...
Build an Ollama Eval Harness
Design and implement a lightweight evaluation harness for a language model served locally through Ollama. The harness should: - Read a dataset of eval...
Implement and Debug Backprop in NumPy
Two-Layer Neural Network: Backpropagation and Gradient Check (NumPy) You are implementing a fully connected two-layer neural network for multi-class c...
Find Earliest Column With One
You are given access to a binary matrix through an API rather than direct storage. The matrix has m rows and n columns. Each row is sorted in nondecre...
Multi-Agent Collision Simulator (Unicycle Kinematics)
Multi-Agent Collision Simulator (Unicycle Kinematics) You are given $N$ agents moving in a 2D plane. Each agent is a disk of fixed radius and moves ac...
Implement a thread-safe money transfer
Problem: Implement a concurrent-safe transfer function You are given an in-memory store of bank accounts: - Each account has an accountId and a balanc...
Design a typeahead search service
Design a search autocomplete system for a large application. As a user types a prefix, the system should return relevant suggestions with low latency....
Design a production file storage service
System Design: Production-Grade File Storage Service Problem Design a production-grade file storage service with the following APIs, semantics, and co...
Design experiments for payments, search, and promotions
You are a Data Scientist supporting a consumer marketplace app (users search restaurants and place orders). Answer the following product experimentati...
Design an extensible expense rule evaluator
Scenario You are building a corporate employee expense card product. Admins define policies (“rules”) to prevent misuse and to flag policy violations....
Find frequent IPs from a huge file
You are given a very large log file (too large to fit in memory). Each line contains an IPv4 address (e.g., 203.0.113.7). Design an approach to answer...
Design a secure document vault
Design a secure document vault product similar to a cloud repository for sensitive files. The system should allow authenticated users to upload, store...
Explain multithreading vs multiprocessing
In the context of implementing a crawler, answer the following: 1. What is the difference between multithreading and multiprocessing? 2. How do these ...
Minimum Bills and Coins to Make Change
You are building the change-dispensing logic for a self-checkout cash register. Given a purchase change amount (in dollars, e.g. 6.35), compute the mi...
Answer Amazon Leadership Principle Scenarios
In an Amazon Data Scientist intern virtual interview, answer behavioral questions using the STAR method and tie each story to Amazon Leadership Princi...
Compare Losses and Explain LoRA
ML Fundamentals: Loss Functions and Low-Rank Adaptation This is a rapid-fire ML fundamentals screen. You are expected to reason precisely about loss f...
Design delivery driver payment system
Design a delivery-driver payment system Design and implement an in-memory, object-oriented service that tracks delivery-driver work and computes payro...
Validate order book data across multiple databases
Assume your organization stores order book–related data in multiple databases (e.g., one for raw exchange messages, one for normalized orders, one for...